Improvement in blowers



'Ntra raras BENNET HOTGHKISS, OF NEW HAVEN, CONNECTICUT.

IMPROVEMENT IN BLovvEFts.

Specification forming part of Letters Patent No. 110,482, dat-cdNovember 3, 18652.

To (all whom it may concern:

Beit known that l, BENNET IIOTCHKISS, of the city and county of NewHaven and State ot' ConnecticutJ have invented new and usefulImprovements in Fan-Blowers; and I do hereby declare the following to bea full, clear, and cXact description 'ot' the construe tion andoperation of the same when taken in connection with the accompanyingdrawings, which form part of this specification, in which- Figure 1f isa side view. Fig. 2 is a longitudinal section. Fig. 3 is a transversesection.

Sameletters of reference indicate like parts.

In the common fan-blower the blades or fans are large and neverexceeding six in number, usually three rfour. '.lhe airis drawn throughopenings in both sides of the shell or case, and discharged from anopening tangential to the circle described by the blades. In this mannerof receiving and discharging the'air by the use of such large bladeslthe air forced before them (the blades) when re'- leased from thedirect action of the blades, as it is when the blade passes the outlet,rebounds and is struck by, the air before the next blade and produces aconcussion, the rapid succession of' which occasions the unpleasantnoise always attending the use of such blowers. the rotation of the airnearly around the case, consumes no small proportion of the powerrequired to maintain the blast. i

The object oi' my invention, therefore, is to produce a blower requiringmuch less power than the common blower, and at the same time noiselessin-its operation.

It consists in .an outward shell or case within which, upon ,an axis, Ihang two wheels placed the required distance apart, (according to thesize of the blower, 1 prefer about onefourth the diameter of thewheels). In the rims of these two wheels, and extending from the rim ofone wheel to the rim of the other, I set and 'tix blades not exceedingin width onetwentieth the diameter of the wheels, and placed at a littledistance apart, as more fully set forth hereinafter. I make the bladesslightly convex upon one side and set them so that'the convex side willbe inclined outward iroxn lthe wheel, the wheels to revolve in adirection opposite to the inclination of the This concussion, togetherwith blades. The result is that air is drawn' in through the center ofthe wheels to supply the vacuum occasioned by the revolution 0 theblades. The air passes from within the wheel outbetween the many bladesinto an air-chamber, and, owing to the peculiar form where the blast isrequired.

To enable others skilled in the art to make and use my improved blower,I will proceed to describe its construction and operation.

A is the shell or caseinclosing the fan, and also forms the air-chamber.

. B B are two wheels,1xed to an agile, C, which is made to revolveinbearings D D.

a a are .blades fixed, one end into rim of each of the two wheels B B. Imake these blades from thin sheet metalcurved, as shown in Fig. 2, andset so that the convex side will face in the direction in which thewheel revolves, and inclined 'in the opposite direction, as shown inFig. 2. t

E is the driving-pulley fixed tothe arbor (J. F are openings through theside of the shell to admit air to supply the blast.

H is the air chamber; 1, the outlet. l place 'a partition, L, within theease, (see Pig. 3,)

and between the fan and outlet, to form apassage from the air-chamber tothe outlet. Red arrows denote the currents of air. When power is appliedand the fans or blades revolving, the air which is before them isthrowno" and a fresh supply drawn through the inlet. The air thusthrown oit'is forced into the air= chamber and through the outlet to theconductors. 'Ihe nearer together the floats or blades are Vplaced thenarrower they may be, (but the width before mentioned experiments have4proved'to be about right, provided, however, that they be so wide that aline drawn at' right angles with and' over one blade will strike thenext bladeback above its lower edge, as-shown inFig.- 2, and but littlemore than this width must be used else the air will be rotated with theblades. flu this manner a constant and steady draft is kept up betweenall the blades.; consequently` there cannot be rebound or concussionofthe mow` -ing or compressed ar,wthoiit which there can be no noise,asbefore shown, and the object of myinvention fully accomplished anassertion warranted by numerous practical experimentsrproving the theoryof my invention-as herein set forth to be practically correct,

Therefore, having fully Eet/forth my inven tion, I do not broadly claime curved "olado for fan-blowers, as such is not new; but

Whatl claim as of my invention, end new and useful, and desire to secureby Letters latent,is i Y The blades a a when the Same are of the formand set relatively to each other iu the manner described, and combinedwith an airol1 amber, H, inlets F, and outlet I, substantially auslandfor the purpose specified.

BENNE'IHOTCHKISS. Witnesses: v

JOHN E EARIE,

IRUFUS SANFon'

